Electric switch



March 19, 1929, E DT 1,706,133

ELECTRIC SWITCH Filed 00117, 1925 Inventor: Kun o Baue rsohm id't,

His A'Ctprney.

Patented Mar. 19, 1929.

UNITED STATES PATENT OFFICE.

KUNO BAUERSCHMIDT, OF KARLSHORST, GERMANY, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION NEW YORK.

ELECTRIC SWITCH.

Application filed October 17, 1925 Serial No.

My invention relates to electric switches of the type in which aresistance is momentarily connected in the circuit at each opening andclosing of the switch.

An Object of mv invention is the provision of an improved switch of thischaracter in which terminals of the resistance are normally completelyseparated from the main switch contacts.

My invention will be better understood from the following descriptiontaken in con-' nection with the accompanying drawing, and its scope willbe pointed out in the appended claims.

Referring to the drawing, Figs. 1 and 2 show respectively a sideelevation and a top view of a switch illustrating my invention.

In the drawing 1 have shown at 1 a cover which is adapted to close thetop of a vessel containing an insulating fluid, such for example as oil.in which the contacts are immersed. Insulator bushings 2 are mounted inthe cover and at their lower ends carry the fixed main contacts 3 withwhich cooperate the movable main contacts 4 carried by the bridgingnumber 5. Separate insulators 7 are secured to the cover 1 and eachsupports a fixed auxiliary contact 8 adjacent which is a second fixedauxiliary contact 9 which is connected with the fixed main contact 3 andsupported by the insulator bushing 2. The fixed resistance 10 has itsends connected rcspcctively with the two fixed auxiliary contacts 8.Supported bv the insulating tubes 11 to which also the bridging member 5is secured are the members 12 which carry the movable auxiliarv contacts18. The arrangement is such that when the main switch is fully closedthe auxiliarv contacts 13 are disengaged .from the auxiliary contacts 8and 9 but during the opening and closing movement of the main switch thecontacts 13 engage contacts 8 and 9. Thus when the main contactsseparate, the resistance is included in the circuit controlled by theswitch, the circuit icing finally completely opened. Conversely inclosing, the resistance is mo mentarily cut into the circuit before themain contacts engage. By the construction disclosed the resistance iscompletely separated from the circuit in both the closed and openpositions of the switch and by supporting the contact terminals of theresistance from the cover by separate insulators the resistance is62,956, and in Germany Novcmber 8, 1924.

normally more thoroughly insulated from the circuit controlled than itit were sup ported by the insulator bushings 2.

l/Vhat I claim as new and desire to secure by Letters Patent of theUnited States is:

1. An electric switch of the enclosed fluid break type comprising acover, insulator bushings supported thereby, a fixed main contactsupported by each of said bushings, a movable bridging member havingmain contacts adaptedto engage said fixed main contacts, a pair ofseparate fixed auxiliary contacts, adjacent eachof said main fixedcontacts, means connecting one auxiliary contact of each of said pairswith the adjacent: main contact, insulating means for independentlysupporting the other auxiliary contact of each pair from said cover, aresistance connecting said other auxiliary contacts, and auxiliarycontacts fixed to said bridging member arranged to engage the auxiliarycontacts comprising each pair during the opening and closing movementsof the main contacts and to be disengaged from both of said auxiliarycontacts when the switch is in fully closed and in fully open position.

2. An. electric switch of the enclosed fluid break type comprising acover, insulator bushings supported thereby, a fixed main contactsupported by each of said bushings, a movable bridging member havingmain contacts adapted to engage said fixed main contacts, a pair ofseparate fixed auxiliary contacts adjacent each of said main fixedcontacts, means connecting one auxiliary contact of each of said pairswith the adjacent main contact, insulators secured to the cover andspaced from the insulator bushings for supporting the other auxiliarycontact of each pair, a resistance enclosed with the switch contacts andhaving its terminals connected respectively with said other auxiliarycontacts, and movable auxiliary contacts fixed to said bridging memberand insulated from the main contacts carried thereby for engaging thefixed auxiliary contacts during the opening andclosing movements of themain contacts, the movable auxiliary contacts being out of engagementwith both of said fixed auxiliary contacts when the switch is in openand in fully closed position.

In witness whereof, I have hereunto set 111 hand this 19th day ofSeptember, 1925.

KUNO BAUERSCI'IMIDT.

